Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.098303
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Funding
- AFOSR Young Investigator Program [FA95550-12-1-0315]
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We optically drive a trapped microscale probe through entangled DNA at rates up to 100x the disentanglement rate (Wi approximate to 100), then remove the trap and track subsequent probe recoil motion. We identify a unique crossover to the nonlinear regime at Wi approximate to 20. Recoil dynamics display rate-dependent dilation and complex power-law healing of the reptation tube. The force response during strain exhibits key nonlinear features such as shear thinning and yielding with power-law rate dependence. Our results, distinctly nonclassical and in accord with recent theoretical predictions, reveal molecular dynamics governed by individual stress-dependent entanglements rather than chain stretching.
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